Error code reference

Carrier Furnace Error Code 12

Blower runs for 90 seconds after power up if unit is powered up during a call for heat (R-W closed) or R-W…

Blower runs for 90 seconds after power up if unit is powered up during a call for heat (R-W closed) or R-W opens during blower on-delay; this is normal operation.

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M+ Max·Carrier furnace

12 on my Carrier furnace

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Blower runs for 90 seconds after power up if

From Service Manual 102647, p.19:

1.Access service mode to confirm the active fault code and read stored error history.

2.Inspect the exhaust duct from the unit to the wall cap. A crushed or lint-blocked duct is the most common cause of airflow-related faults.

3.Measure static pressure at the blower housing with the lint screen removed. Expected: ≥ 1.0 in. w.c. in a still-air test.

Part W10861225

Blower wheel and housing

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